1000000000 (number)

1000000000 (number)

1,000,000,000 (one billion, short scale; one thousand million or milliard, long scale) is the natural number following 999,999,999 and preceding 1,000,000,001.

In scientific notation, it is written as 109.

A billion traditionally equated to one million million, (1,000,000,000,000) though the short scale (American English) billion of merely one thousand million (1,000,000,000) has been adopted in finance and increasingly in other fields. The unambiguous term thousand million has the same meaning in both scales.

In South Asian English, it is known as 100 crore or 1 Arab.

The term milliard can also be used to refer to 1,000,000,000; this name very often appears in other languages.

In British English, a billion used to refer to a million millions. However, this is no longer the case.

The SI prefix giga indicates 1,000,000,000 times the base unit.

See Orders of magnitude (numbers) for larger numbers; and long and short scales.